Figure 6

Temporal and spectral distributions of pulses and chirps inside the cavity in the following points: the chirp sign change (from positive to negative) in the Tm-doped fibre (a, e), the end of Tm-doped fibre (b, f), the chirp sign change (from negative to positive) in Hi–Ge fibre (c, g), the output coupler (d, h). Blue lines are the results of the numerical modelling; red dots are the approximation using a Gaussian shape function; green lines and dots show the chirp distributions in time.